Shatapatha Brahmana 10.5.4.1

10.5.4.1

ayaṃ vāva loka eṣo'gniścitaḥ tasyāpa eva pariśrito manuṣyā yajuṣmatya iṣṭakāḥ sūdadohā oṣadhayaśca vanaspatayaśca purīṣamāhutayaḥ samidho'gnirlokampṛṇā tadvā etatsarvamagnimevābhisampadyate tatsarvo'gnirlokampṛṇāmabhisampadyate sa yo haitadevaṃ veda lokampṛṇāmenam bhūtametatsarvamabhisampadyate

Verily, this (brick-)built Fire-altar (Agni) is this (terrestrial) world:--the waters (of the encircling ocean) are its (circle of) enclosing-stones; the men its Yagushmatîs (bricks with special formulas); the cattle its Sûdadohas; the plants and trees its earth-fillings (between the layers of bricks), its oblations and fire-logs; Agni (the terrestrial fire) its Lokamprinâ (space-filling brick);--thus this comes to make up the whole Agni, and the whole Agni comes to be the space-filler; and, verily, whosoever knows this, thus comes to be that whole (Agni) who is the space-filler.